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Improving Search in Tele-Lecturing: Using Folksonomies as Trigger to - - PowerPoint PPT Presentation
Improving Search in Tele-Lecturing: Using Folksonomies as Trigger to - - PowerPoint PPT Presentation
Improving Search in Tele-Lecturing: Using Folksonomies as Trigger to Query Semantic Datasets to Extract Additional Metadata International Conference on Web Intelligence, Mining and Semantics (WIMS 2011) Franka Moritz, Maria Siebert and
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Improving Search in Tele-Lecturing | Moritz, Siebert, Meinel | WIMS 2011
Research project: tele-TASK
■ System for recording lectures ■ Records two video and one audio stream ■ Used since 2001 ■ More than 3200 lectures recorded ■ More than 8000 video podcasts provided
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Improving Search in Tele-Lecturing | Moritz, Siebert, Meinel | WIMS 2011
tele-TASK Web Portal http://www.tele-task.de
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Improving Search in Tele-Lecturing | Moritz, Siebert, Meinel | WIMS 2011
Motivation
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Improving Search in Tele-Lecturing | Moritz, Siebert, Meinel | WIMS 2011
Embedding DBPedia into the tele-TASK portal meta data
Different possibilities for data sources
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Improving Search in Tele-Lecturing | Moritz, Siebert, Meinel | WIMS 2011
Usage of the DBpedia data
■ Extraction of keywords ■ Search for representation in DBpedia ■ Parsing information from DBpedia ■ Adding information to the database □ Synonyms or generalizations of terms □ Desciptions of a term ■ Using the parsed information in different projects
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Improving Search in Tele-Lecturing | Moritz, Siebert, Meinel | WIMS 2011
Definition of Tags
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Improving Search in Tele-Lecturing | Moritz, Siebert, Meinel | WIMS 2011
Extending the Search function
■ Adding additional data to searchable fields □ Generalizations of tags □ Synonyms of tags ■ Search for tags with the search term in the description ■ Extending the search request □ e.g. using synonyms
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Improving Search in Tele-Lecturing | Moritz, Siebert, Meinel | WIMS 2011
Extending the Recommendation Function – Synonyms (1)
Synonyms: ■ Synonyms create an equivalence relation ■ Each group of synonyms generates an equivalence class ■ Interpret tags in one equivalence class as one word
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Improving Search in Tele-Lecturing | Moritz, Siebert, Meinel | WIMS 2011
Extension of the Recommendation function - Synonyms (2)
■ The normal similarity function for tags is extended to a more complex version ■ Each equivalence class of tags is treated like one tag in the simple calculation function
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Improving Search in Tele-Lecturing | Moritz, Siebert, Meinel | WIMS 2011
Extension of the Recommendation function - Generalization (1)
■ Generalization creates partial
- rder
■ Distance between objects is unknown ■ Defining sets of parents and children ■ Calculating the distance of two
- bjects in the tree as dist(s,t)
Animal Bird Insect Finch Stork Bee Mosquito Chaffinch
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Improving Search in Tele-Lecturing | Moritz, Siebert, Meinel | WIMS 2011
Extension of the Recommendation function - Generalization (3)
■ Using distance as weigth for calculation of similarity ■ Using the weigths of the tags
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Improving Search in Tele-Lecturing | Moritz, Siebert, Meinel | WIMS 2011
Conclusion and Future Work
■ Implementation for tags was shown ■ More triggers have to be included ■ Problems to solve: □ To few tags to generate for a good result evaluation ◊ Advancement of user interest ◊ Easier access to the functions □ The results are not visible to the user
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